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About 4 in 10 never-married U.S. teenagers aged 15-19 have had sexual intercourse at least once in their lifetime, according to a report released today by the Centers for Disease Control and Prevention.

About 4 in 10 never-married U.S. teenagers aged 15-19 have had sexual intercourse at least once in their lifetime, according to a report released today by the Centers for Disease Control and Prevention.

People who smoke certain U.S. cigarette brands are exposed to higher levels of cancer-causing tobacco-specific nitrosamines (TSNAs), the major carcinogens and cancer-causing agents in tobacco products, than people who smoke some foreign cigarette

People who smoke certain U.S. cigarette brands are exposed to higher levels of cancer-causing tobacco-specific nitrosamines (TSNAs), the major carcinogens and cancer-causing agents in tobacco products, than people who smoke some foreign cigarette

CDC will hold a ribbon cutting ceremony to celebrate the opening of the new laboratory facility, Building 23.

CDC will hold a ribbon cutting ceremony to celebrate the opening of the new laboratory facility, Building 23.

Although women account for only about 20 percent of the world's 1.3 billion smokers, tobacco use among women is on the rise.

Although women account for only about 20 percent of the world's 1.3 billion smokers, tobacco use among women is on the rise.

The rate of a severe form of Escherichia coli diarrhea significantly decreased in 2009, reaching the lowest level since 2004, according to a report released Thuday by the Centers for Disease Control and Prevention.

The rate of a severe form of Escherichia coli diarrhea significantly decreased in 2009, reaching the lowest level since 2004, according to a report released Thuday by the Centers for Disease Control and Prevention.